What are daily active users (DAU)?

The count of unique users active in a product on a given day — with 'active' defined by the team, which is where the metric's honesty or vanity is decided.

What is a good DAU/MAU ratio?

One read against the product's natural frequency — 50% suits messaging, 10-20% many consumer apps, and a weekly-cadence product can be healthy far lower; the ratio measures stickiness, not virtue.

How should DAU be analyzed?

Anchored to a value action, decomposed into new, resurrected, and churned flows, segmented by cohort — and never set as a target, which invites engagement bait.

Growth Marketing Glossary

Daily Active Users (DAU)

D·A·Unoun

Who showed up today — the daily pulse of a product, worth exactly as much as the definition of 'active' behind it.

Schematic — the daily pulse of unique users

Term: Daily Active Users (DAU)
Counts: Unique users active in one day
Paired with: MAU — the DAU/MAU stickiness ratio
Hinges on: The definition of 'active'

Forms & parts of speech

DAU · noun

The daily user count.

"DAU hit a record - until the team noticed 'active' included opening a push notification by accident."

Definition in plain terms

Daily active users (DAU) is the count of unique users who were active in a product on a given day — the daily pulse of an app, site, or platform, and the headline metric of consumer products from games to social networks. Every word in the definition does work, and one does the most: 'active' is whatever the team decides it is, and the metric inherits all the honesty or vanity of that choice. A login? An app open? A meaningful action? Three different products are being measured.

The mechanics

The craft starts with the activity definition: serious teams define 'active' as an action that correlates with the product's value (a message sent, a session over N seconds, content actually consumed), not mere presence — because push-notification opens and accidental launches inflate presence-based DAU into noise (the same value-anchoring discipline ACTIVATION metrics demand). The companion reads give the number its meaning. DAU/MAU — daily actives divided by MONTHLY ACTIVES — is the classic stickiness ratio: 50% means the average user shows up every other day (messaging-app territory), 10% means roughly three days a month (utility territory), and the ratio's fair value depends entirely on the product's natural frequency — a tax product with 8% DAU/MAU may be healthier than a social app at 25%. Segmented DAU separates the trend's causes (new users versus returning, the COHORT lens applied daily), and DAU moves should always be decomposed into acquisition, resurrection, and churn flows before anyone celebrates or panics. The lies are standard: averages hiding weekday/weekend cycles, definition changes mid-chart, bot and notification inflation, and the deepest one — DAU as a goal, which invites engagement-bait mechanics that lift the count while degrading the product (Goodhart's law, consumer edition).

When it matters

DAU matters for products whose value is frequency — social, messaging, games, news, anything habit-shaped — and for the investors and ad models that price them. It matters less, and misleads more, for products whose natural cadence is weekly or monthly, where forcing daily engagement manufactures vanity. The discipline is a value-anchored definition of active, the DAU/MAU read against the product's natural frequency, decomposition into new-resurrected-churned flows, and a standing refusal to set DAU as a target rather than a thermometer.

Worked example. A language-learning app celebrates record DAU after a gamified streak feature ships - then retention cohorts tell the other half: users open the app daily to preserve streaks, complete one trivial exercise, and leave; lesson completion per active day has fallen 40%. The metrics rebuild starts with the definition: 'active' becomes completing at least one full exercise, restating the chart honestly (DAU drops 22% overnight, and nobody mourns the ghosts). DAU/MAU gets read against the product's real cadence - the target is meaningful daily practice, so the ratio matters - and the dashboard decomposes every move into new, resurrected, and churned learners. The streak feature is reworked to reward completed lessons rather than opens. Six months later DAU is below the vanity peak and lesson volume is at an all-time high - the company stopped counting visits and started counting value, which was the only count that ever predicted renewals.

Failure modes to watch. Presence-based definitions counting accidental opens as activity; definition changes mid-chart, silently rebasing the trend; averages hiding weekday cycles and seasonal cliffs; DAU set as a target until engagement bait lifts the count and degrades the product; and DAU/MAU judged against other products' cadences instead of the product's own.

Synonyms & antonyms

Synonyms

daily active usersDAUdaily actives

Antonyms

monthly active usersregistered users

Origin & history

DAU/MAU vocabulary consolidated in the social-and-mobile era — Facebook's early-2010s SEC filings made daily and monthly actives the public language of engagement, and the DAU/MAU 'stickiness' ratio became consumer products' shorthand for habit strength.

Etymology: source.

Usage trends

Search interest for this term over the last five years:

View interest-over-time on Google Trends →

Common questions

What are daily active users (DAU)?: The count of unique users active in a product on a given day — with 'active' defined by the team, which is where the metric's honesty or vanity is decided.
What is a good DAU/MAU ratio?: One read against the product's natural frequency — 50% suits messaging, 10-20% many consumer apps, and a weekly-cadence product can be healthy far lower; the ratio measures stickiness, not virtue.
How should DAU be analyzed?: Anchored to a value action, decomposed into new, resurrected, and churned flows, segmented by cohort — and never set as a target, which invites engagement bait.

Related tools & calculators

toolA/B test sample size

Resources & people to follow

referenceWikipedia — Active users
referenceProduct-analytics practice on activity definitions and stickiness
referenceRGM analysis — count value, not visits; DAU is a thermometer, never a target

Curated, non-competitor resources verified per term.

Related training

modulePerformance marketing

Disciplines

Areas of marketing where daily active users (dau) is a core concern:

Performance marketingGrowth strategy

Sources

trendsGoogle Trends — "daily active users"